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Unique Smooth Trans Focus G MasterG Master design combines extraordinary sharpness and smooth Bokeh in one lens. STF (Smooth Trans Focus) realizes an ultimate collaboration of impressive bokeh and high resolution that only Sony can offer. It is not easy to achieve spatial frequency of 50 line pairs per millimeter at a lens' widest aperture and produce smooth beautiful bokeh at the same time, but that is Sony's baseline for G Master design. Unprecedented resolution and other demanding design parameters yield outstanding reproduction of the most detailed subjects and scenes with superior contrast throughout every frame. G Master resolution is simply the highest in its class.

Apodization element eliminates distortion of defocused highlightsA unique feature of the STF lens is the special optical apodization (APD) element which produces exceptionally smooth background and foreground bokeh. The APD element acts as a graduated neutral density filter, with light transmissivity highest at the center and then gradually decreasing towards the periphery to ensure extraordinarily smooth bokeh. The APD element ensures equally smooth foreground and background defocus, without double-line effects.

Selectable Macro mode - two lenses in one.Besides being a perfect portrait lens, the SEL100F28GM incorporates a convenient ring-switch on the lens barrel to select from full range to a macro range. With close-up focus capability up to 1.87ft. (0.57m) min. and 0.25x max. magnification. It's like having two lenses in one.

Significantly reduces blurHigh-performance Optical SteadyShot image stabilization is built right into the lens for sharp, blur-free images with a wide range of subjects. The stabilization lens is driven by a linear motor for fast, precise stabilization. Additionally, 5-axis image stabilization becomes available when used with a (Alpha) series cameras that feature built-in image stabilization.

Manual aperture ring w/ selectable on/off click for stills or movieA responsive manual aperture ring offers positive action that will satisfy professional photographers and moviemakers alike. The aperture ring click stops can be switched on or off as required. "Off" is the preferred setting for moviemaking since it results in the least aperture operation noise. When "On" the ring provides tactile feedback that is useful when shooting stills. Since this lens incorporates an apodization (ADP) lens element, the aperture ring is calibrated for F-stops and T-stops.

11-blade circular aperture contributes to gorgeous bokehThe 11-blade circular aperture maximizes the beauty of this large-aperture prime-lens, contributing to impressive images in which the subject stands out against a smoothly defocused foreground and background bokeh as well as perfectly round points of defocused light. Conventional aperture blades have flat sides creating unappealing, polygonal shaped defocused points of light. a (Alpha) lenses overcome this problem through a unique design that keeps the aperture almost perfectly circular from its wide-open setting to when it is closed by 2 stops. Smoother, more natural defocusing can be obtained as a result.

Aspherical lens dramatically reduces spherical aberrationAspherical lens design dramatically reduces spherical aberration while also reducing lens size and weight. Spherical aberration is a slight misalignment of the light rays projected on the image plane. This is caused by differences in refraction at different points on conventional spherical lenses which degrade image quality in large-aperture lenses. Specially shaped "aspherical" elements near the diaphragm restore alignment of light rays at the image plane, maintaining high sharpness and contrast even at maximum aperture and can also be used at other points in the optical path to reduce distortion. Well-designed aspherical elements can reduce the total number of elements required in the lens, thus reducing overall size and weight.

F2.8 max aperture maintains exposure and depth of fieldF2.8 max aperture maintains exposure and depth of field. When changing your aperture to defocus the background, the areas out of the focal plane appear blurred. This 'bokeh' effect of the blurred background is enhanced with circular aperture blades used in this lens.

Focus hold button, programmable for multiple functionsThe focus hold button not only performs its primary function to lock focus when recomposing, but can be customized to a number of other functions depending on your needs. In addition to Focus Hold, these custom functions include: Eye AF, AF On, Aperture Preview, Shot Result Preview or Bright Monitoring.

Nano AR coating suppresses reflections, flare and ghostingSony's original Nano AR Coating technology minimizes flare and ghosting, for dynamic range that achieves lifelike detail and gradation with advanced camera sensors. This precisely defined regular nano-structure allows accurate light transmission, contributing to high-quality images, even more so than with lenses that use coatings with an irregular nano-structure. The reflection suppression characteristic of the Nano AR Coating is superior to conventional anti-reflective coatings, providing a notable improvement in clarity, contrast, and overall image quality.

Instant auto/manual focus selectionInstantly and quickly switch between auto and manual focus via an AM/MF switch on the side of the lens. This makes operation faster and easier as you let the camera and lens focus for you, or decide to take control and manually focus on the precise point you chose.

Internal Focus maintains lens dimensionsOnly the middle groups of the optical system move to achieve focus, so the overall length of the lens does not change when focusing. This is especially important when using for video recording. Other important benefits include fast autofocusing and a short minimum focusing distance. Also, the filter thread at the front of the lens does not rotate, which is convenient when using a polarizing filter.